[mrtg] Graphing two serial interfaces

[Hart, Kevin]

Hello,

My apologies if this has been asked already but I've searched the archives
and have not found
the exact answer to this question.

I am curious as to how one would approach the problem of graphing the
aggregate traffic of 
two serial interfaces on a router. Graphing the individual interfaces works
fine but I'm unclear
on how combine statistics of both interfaces into a single graph. 

Specifically, I'm looking for combined inbound and combined outbound traffic
on one graph.

Thanks in advance,
Kevin


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